Anti-Müllerian hormone (AMH): what it is and what the test tells you

A referral for anti-Müllerian hormone often raises questions: the name is unfamiliar, and the result on the report is just a number. Let us calmly explain what this substance is, where it is produced, and in which situations a doctor looks at it. Anti-Müllerian hormone (also called Müllerian hormone or anti-Müllerian hormone) is one of the markers assessed as part of a panel, not on its own.

What anti-Müllerian hormone is

AMH is a protein molecule, a hormone that limits excessive growth in the reproductive organs in both men and women. The name is linked to the German scientist Johannes Müller: he described a duct common to embryos — the Müllerian duct — from which the uterus, fallopian tubes, and vagina develop in women. In structure, the AMH molecule is larger and more complex than the molecule of follicle-stimulating hormone (FSH).

Where AMH is produced and what it does

In the male embryo, the testis begins to secrete AMH at about the 9th week of pregnancy: the hormone converts the Müllerian duct into the prostatic utricle and the appendix of the testis. In women, AMH is involved in ovarian function: it ensures the rapid recruitment and initial growth of primordial follicles and prepares the ovary to respond to FSH. In evolution, this hormone first appears in fish; it is also present in reptiles, birds, and mammals.

Why an AMH test is ordered

AMH is used in assessing a woman's fertility. However, its level alone cannot be relied upon: the hormone is assessed together with others — FSH, LH, and estradiol levels — as well as with the condition of the ovaries on ultrasound. Evaluation for difficulty conceiving may include blood tests, imaging methods, and, for men, semen analysis.

What affects fertility

Fertility overall is affected by age, weight, sexually transmitted infections, smoking, alcohol, environmental factors, and stress — these circumstances are discussed at the appointment together with test results.

• Age: fertility declines with age.
• Weight: excess body weight and marked underweight in women can affect ovulation.
• Sexually transmitted infections, including chlamydia, can affect fertility.
• Smoking, including passive smoking, reduces the chances of conception and semen quality.
• Stress can affect relationships and sexual desire and, in severe cases, ovulation and sperm production.

When to see a doctor

You should see a doctor if pregnancy does not occur after a year of regular sexual intercourse without contraception. For women aged 36 and older, as well as those who already know about possible fertility problems, a visit is planned earlier. With irregular menstruation, a history of pelvic inflammatory disease, or previous fertility concerns, consultation should not be delayed.

An AMH result on its own is not a reason to call emergency services; 103 or 112 — if signs of a life-threatening condition appear, such as signs of a stroke or heart attack.

This material is for reference: it helps you understand the meaning of the test but does not replace a doctor's consultation, which will assess your situation as a whole.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer